Values.Hdr10PlusSourceSetting for HDR10+ metadata insertion
type nonrec t = {masteringMonitorNits : int option;Specify the HDR10+ mastering display normalized peak luminance, in nits. This is the normalized actual peak luminance of the mastering display, as defined by ST 2094-40.
*)targetMonitorNits : int option;Specify the HDR10+ target display nominal peak luminance, in nits. This is the nominal maximum luminance of the target display as defined by ST 2094-40.
*)}